Inspection Procedure 1
INSPECTION PROCEDURE 1: Convertible Top does not Operate.
CIRCUIT OPERATION
- The power supply of convertible top control module is supplied by the power window relay.
- The convertible top control module receives the OPEN and CLOSE signals of convertible top switch by the separate circuits.
- The OPEN signal and the CLOSE signal are received by the ECU terminals No. 65 and No. 66 respectively.
TROUBLESHOOTING HINTS
- Malfunction of convertible top control module power supply line
- Malfunction of convertible top switch OPEN or CLOSE signal line
- Malfunction of convertible top switch
- Malfunction of convertible top control module
DIAGNOSIS
Required Special Tool
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
- MB991223(MB991222): Harness set (Probe)
- MB992006: Extra fine probe
STEP 1. Using scan tool MB991958, read diagnostic trouble code.
Q. Is DTC set?
YES : Perform the troubleshooting for DTC (Refer to Convertible Top).
NO (Communication with scan tool is not possible.) : Go to Step 2.
NO (No DTC is set.) : Go to Step 4.
STEP 2. Using scan tool MB991958, diagnose the CAN bus line.
Q. Is the convertible top control module only displayed as a trouble symptom by the results of CAN bus line diagnostics?
YES Go to Step 3.
NO Repair the CAN bus line CAN Bus Diagnostics Chart).
STEP 3. Check convertible top control module connector D-46 for loose, corroded or damaged terminal, or terminals pushed back in connector.
Q. Is the check result satisfactory?
YES Check the harness between convertible top control module connector D-46 (terminal 69) and power window relay. Repair as necessary.
NO Repair and replace the damaged component(s).
STEP 4. Check convertible top switch connector C-30 for loose, corroded or damaged terminal, or terminals pushed back in connector.
Q. Is the check result satisfactory?
YES Go to Step 5.
NO Repair or replace the damaged component(s).
STEP 5. Convertible top switch check
Check for continuity at the convertible top switch.
Q. Is the check result satisfactory?
YES Go to Step 6.
NO Replace the convertible top switch.
STEP 6. Measure the voltage at convertible top switch connector C-30.
(1)Disconnect convertible top switch connector C-30, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ON" position.
(3)Measure the voltage between terminal 3 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).
Q. Is the check result satisfactory?
YES Go to Step 7.
NO Check the harness between convertible top switch connector C-30 (terminal 3) and ignition switch (IG2). Repair as necessary.
STEP 7. Check convertible top control module connector D-46 and intermediate connector C-203 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q. Is the check result satisfactory?
YES Go to Step 8.
NO Repair and replace the damaged component(s).
STEP 8. Check the wiring harness between convertible top control module connector D-46 (terminal 65, 66) and convertible top switch connector C-30 (terminal 1, 4).
Q. Is the check result satisfactory?
YES Go to Step 9.
NO Repair the wiring harness.
STEP 9. Retest the system.
Q. Does the convertible top operate?
YES Intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Replace the convertible top control module.